Shopkeeper NPCs

Shopkeeper NPCs buy and sell items, equipment, weapons, furniture, and more! These are the NPCs that have established places of business, but there are some NPCs in more obscure locations that also buy and sell things. Some shopkeepers only sell to premium account players.

Shopkeepers

After greeting the shopkeeper (Non-Playable Character) with a "hi" (a very common salutation for them since it is only made up of two letters), they may ask you what you need or they may just reply with a Hello or some variation of that phrase.

Browsing a Shop's Category List

Most NPCs will give you a list of their items available for sale if you ask them what do you sell?. Some also have blackboards on the wall listing the sale items. If they sell many things, they organize them by categories, you can browse those categories by replying with the name of the category you want.

For example, if you are talking with Zaidal, the furniture shopkeeper of Port Hope and you ask what do you sell? he will reply I sell tables, chairs and drawers, all handmade with the material that the jungle has to offer.. Note that the categories are tables, chairs and drawers.

After that you can reply tables and they will give you a list of available type of tables for sale, in our case he or she replies I can offer you stone tables, tusk tables, bamboo tables and trunk tables.

Trading with a Shopkeeper

Before update 8.2 you would be required to greet the NPC and ask to "buy <number> <item>". For example, "buy 10 ham" would prompt the shopkeeper to ask you to confirm the purchase, then by saying "yes" you would have finished your trade.
Since update 8.2 you now need to greet the shopkeeper and ask for a trade, which would bring up a dialog containing a list of things you can purchase.

If the trade function does not work, the shopkeeper may have not been updated in 8.2, and should still work with the buy prior to the update

The trade feature is not limited to buying items, there is also a sell tab which will allow you to sell anything, provided the shopkeeper buys the said item.